01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the rolled oats, all-purpose flour, baking soda, salt, and ground cinnamon until evenly distributed. Set aside.
03 - In a large bowl, beat the softened butter, Biscoff spread, light brown sugar, and granulated sugar using an electric mixer until light and fluffy, about 2–3 minutes.
04 - Mix in the egg and vanilla extract until fully incorporated and the mixture is smooth.
05 - Gradually stir in the dry ingredient mixture until just combined. Avoid overmixing to keep the cookies tender.
06 - Gently fold the chopped Lotus Biscoff cookies into the dough, distributing the pieces evenly throughout.
07 - Scoop dough in roughly 2-tablespoon portions onto the prepared baking sheets, spacing each mound about 2 inches apart. Optionally press additional Biscoff cookie pieces onto the tops for presentation.
08 - Bake for 10–12 minutes until the edges are golden brown and the centers remain slightly soft. Do not overbake.
09 - Allow cookies to cool on the baking sheets for 5 minutes to set, then transfer to a wire rack to cool completely before serving or storing.